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Kondo effect in an Antiferromagnetic metal

Authors
  • Aji, Vivek
  • Varma, Chandra
  • Vekhter, Ilya
Type
Preprint
Publication Date
Jun 05, 2008
Submission Date
Aug 14, 2007
Source
arXiv
License
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Abstract

We study the fate of a spin-1/2 impurity in the itinerant antiferromagnetic metallic phase via a renormalization group analysis and a variational calculation. The local moment - conduction electron interaction hamiltonian in an antiferromagnetic metal is spin non-conserving. We show that for a general location of the impurity, the Kondo singularities still occur, but the ground state has a partially unscreened moment. We calculate the magnitude of this residual moment and the variation of the spin polarization with energy for a substitutional impurity as a function of the staggered magnetization. The usual Kondo effect only occurs if the impurity is placed at points where the magnetization is zero.

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